MOBILE APPARATUS AND METHOD FOR MEASURING THE PROFILE OF A RAILROAD TUNNEL

摘要

A mobile apparatus for measuring the longitudinal profile defining the periphery of a railroad tunnel surrounding a track comprises a carriage mounted for non-stop movement on the track, a distance measuring instrument mounted on the carriage, the instrument including a laser beam emitter and receiver, and a common mount for the laser beam emitter and receiver, the emitter and receiver having an optical axis extending in a vertical plane perpendicular to the longitudinal axis of the track and the optical axis intersecting the longitudinal profile to define the distance between the distance measuring instrument and the longitudinal profile, and an adjustment mechanism for positioning the distance measuring instrument and for fixing the instrument in the adjusted position for selectively measuring a plurality of longitudinal profiles in a selected sector of the periphery. An odometer is mounted on the carriage and emits a control signal upon movement of the carriage and a recording instrument is also mounted on the carriage. A control circuit interconnects the odometer, the distance measuring instrument and the recording instrument for transmitting the control signal to the distance measuring instrument for operating the instrument to emit a signal indicating the distance and to the recording instrument for recording the location of the carriage and the distance measuring instrument along the track, and for transmitting the distance indicating signal to the recording instrument.